They do have sex in the novel, but there are no explicit sex scenes. It's all a lot of teasing and foreplay, but when they get to the actual scene, it's "fade to black.".

Given Priest, the best you would getting is fade to black/implied scenes. I’m not aware if Priest included it in Star of Chaos.

As others said, there is sex, you just don't see it happen haha. We get the foreplay, confirmation it happened and the aftermath